47
COOLING CONFIGURATION — Relevant configurations for
mechanical cooling are located at the local display under
Configuration
COOL. See Table 29.
Enable Compressor A1 (
A1.EN) — This configuration is
used to disable the A1 compressor in case of failure for size 75
to 150 units.
Enable Compressor A2 (
A2.EN) — This configuration is
used to disable the A2 compressor in case of failure for size 75
to 150 units.
Enable Compressor A3 (
A3.EN) — This configuration is
used to disable the A3 compressor in case of failure for size 90
and 100 units. It is always disabled for size 75 units.
Enable Compressor A4 (
A4.EN) — This configuration is
used to disable the A4 compressor in case of failure for size
120 to 150 units. It is always disabled for size 75 to 105 units.
Enable Compressor B1 (
B1.EN) — This configuration is
used to disable the B1 compressor in case of failure for size 75
to 150 units.
Enable Compressor B2 (
B2.EN) — This configuration is
used to disable the B2 compressor in case of failure for size 75
to 150 units.
Enable Compressor B3 (
B3.EN) — This configuration is
used to disable the B3 compressor in case of failure for size 75
to 150 units.
Enable Compressor B4 (
B4.EN) — This configuration is
used to disable the B4 compressor in case of failure for size
120 to 150 units. It is always disabled for size 75 to 105 units.
CSB A1 Feedback Alarm (
CS.A1) — This configuration is
used to enable or disable the compressor A1 feedback alarm.
This configuration must be enabled whenever A1.EN is en-
abled.
CSB A2 Feedback Alarm (
CS.A2) — This configuration is
used to enable or disable the compressor A2 feedback alarm.
This configuration must be enabled whenever A2.EN is en-
abled.
CSB A3 Feedback Alarm (
CS.A3) — This configuration is
used to enable or disable the compressor A3 feedback alarm.
This configuration must be enabled whenever A3.EN is en-
abled.
CSB A4 Feedback Alarm (
CS.A4) — This configuration is
used to enable or disable the compressor A4 feedback alarm.
This configuration must be enabled whenever A4.EN is en-
abled.
CSB B1 Feedback Alarm (
CS.B1) — This configuration is
used to enable or disable the compressor B1 feedback alarm.
This configuration must be enabled whenever B1.EN is en-
abled.
CSB B2 Feedback Alarm (
CS.B2) — This configuration is
used to enable or disable the compressor B2 feedback alarm.
This configuration must be enabled whenever B2.EN is en-
abled.
CSB B3 Feedback Alarm (
CS.B3) — This configuration is
used to enable or disable the compressor B3 feedback alarm.
This configuration must be enabled whenever B3.EN is en-
abled.
CSB B4 Feedback Alarm (
CS.B4) — This configuration is
used to enable or disable the compressor B4 feedback alarm.
This configuration must be enabled whenever B4.EN is en-
abled.
Capacity Threshold Adjust (
Z.GN) — This configuration
provides an adjustment to the SUMZ Cooling Algorithm for
capacity control. The configuration affects the cycling rate of
the cooling stages by raising or lowering the threshold that de-
mand must build to in order to add or subtract a stage of
cooling.
Normally this configuration should not require any tuning
or adjustment. If there is an application where the unit may be
significantly oversized and there are indications of high com-
pressor cycles, then the Capacity Threshold Adjust (Z.GN) can
be used to adjust the overall logic gain. Normally this is set to
1.0, but it can be adjusted from 0.1 to 10. As the value of Z.GN
is increased, the cycling of cooling stages will be slowed.
Compressor Lockout Temperature (
MC.LO) — This config-
uration defines the outdoor air temperature below which me-
chanical cooling is locked out.
Lead/Lag Operation? (
LLAG) — This configuration selects
the type of lead/lag compressor operation for the unit. There
are 3 choices: automatic, circuit A, and circuit B.
0 = AUTOMATIC
If this configuration is set to “AUTOMATIC,” every time
cooling capacity drops to 0%, on the next call for cooling, the
control will start up the first compressor on the circuit that did
not start on the previous cooling cycle.
1 = CIRCUIT A
If this configuration is set to “CIRCUIT A,” every time
cooling capacity drops to 0%, a circuit A compressor is always
the first to start on the next call for cooling.
2 = CIRCUIT B
If this configuration is set to “CIRCUIT B,” every time
cooling capacity drops to 0%, a circuit B compressor is always
the first to start on the next call for cooling.
NOTE: If the unit is configured for a Digital Scroll (Configu-
ration
M.PID
DG.A1 = YES) or Minimum Load Valve
(Configuration
M.PID
MLV = ENABLE), then circuit A
is always the lead circuit regardless of the setting of this
configuration.
If the unit is configured for the Humidi-MiZer
®
adaptive
dehumidification system, then circuit B automatically becomes
the lead circuit when the unit enters into one of the Humidi-
MiZer modes (dehumidification or reheat). The unit will im-
mediately start a circuit B compressor when a Humidi-MiZer
mode is initiated.
MotorMaster Control? (
M.M.) — The condenser fan staging
control for the unit is managed directly by the ComfortLink
controls. There is no physical Motormaster device in the stan-
dard unit. If the unit was ordered from the factory with low am-
bient control (Motormaster) option, nothing further needs to be
done. This configuration must be set to YES if an accessory
low ambient operation Motormaster V Control is installed on
the unit. Setting this configuration to YES alters the condenser
fan staging sequence to accommodate the Motormaster V con-
trol. See Head Pressure Control section, page 55, for more in-
formation.
Maximum Condenser Temp (
SCT.H) — This configuration
defines the saturated condensing temperature at which the head
pressure control routine will increase an outdoor fan stage. The
saturated condensing temperature of either running circuit ris-
ing above this temperature will increase a fan stage. If the out-
door-air temperature is greater than 72 F, then no outdoor fan
staging will occur, and the outdoor fan stage will default to the
maximum stage.
Minimum Condenser Temp (
SCT.L) — This configuration
defines the saturated condensing temperature at which the head
pressure control routine will decrease an outdoor fan stage. The
saturated condensing temperature of both running circuits de-
creasing below this temperature will decrease a fan stage. If the
outdoor-air temperature is greater than 72 F no outdoor fan
staging will occur, and the outdoor fan stage will default to the
maximum stage.
A1 is Digital Scroll (
DG.A1) — This configuration instructs
the unit controls as to whether the A1 compressor is a digital
scroll or regular scroll compressor. If set to YES, the
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